[Refactor] Use flatMap for flattening TOML patch entries

[gonzaloriestra]

WHY are these changes introduced?

The current implementation of flattenToPatchEntries uses an imperative for...of loop with entries.push. Refactoring it to use a declarative flatMap approach makes the code more idiomatic and readable.

WHAT is this pull request doing?

Refactors flattenToPatchEntries in packages/cli-kit/src/public/node/toml/toml-file.ts to use Object.entries(obj).flatMap(...).

How to test your changes?

CI

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 139978933092872357 started by @gonzaloriestra

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